Opeth opened with Master's Apprentices when I saw them on the PROG NATION tour with Dream Theater and Between The Buried and Me.

I was at the same date as you. They totally stole the show! Not sure if I'll be going to the headlining show in October though. First time that I'll be able to see them headlining (other times have been 19+, this time I'm finally of age), but it's in the middle of a busy week right after Enslaved...

That setlist makes it look really tempting though. I'll have to wait until I hear Heritage, which I'm really looking forward to.